Nick Heidfeld's next drive

The scene of the crime.  Quick Nick was robbed!

Well, F1 is back in Montreal.  At the last race there, Kubica and Heidfeld finished 1-2 for BMW Sauber.  As only one of two people in the world who follows Heidfeld gossip on the net (Heidfeld being the other person), here are the possibilities for his near future.

1. Continue with Mercedes as a reserve driver.
2. Continue with Mercedes but also test new Pirelli tires for F1.
3. Replace Pedro de la Rosa at BMW Sauber Ferrari this season.
4. Replace Pedro next season.